utcopy.c

linux-2.6.15.6

/******************************************************************************
 *
 * Module Name: utcopy - Internal to external object translation utilities
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2005, R. Byron Moore
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    substantially similar to the "NO WARRANTY" disclaimer below
 *    ("Disclaimer") and any redistribution must be conditioned upon
 *    including a substantially similar Disclaimer requirement for further
 *    binary redistribution.
 * 3. Neither the names of the above-listed copyright holders nor the names
 *    of any contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 */

#include <acpi/acpi.h>
#include <acpi/amlcode.h>

#define _COMPONENT          ACPI_UTILITIES
ACPI_MODULE_NAME("utcopy")

/* Local prototypes */
static acpi_status
acpi_ut_copy_isimple_to_esimple(union acpi_operand_object *internal_object,
				union acpi_object *external_object,
				u8 * data_space, acpi_size * buffer_space_used);

static acpi_status
acpi_ut_copy_ielement_to_ielement(u8 object_type,
				  union acpi_operand_object *source_object,
				  union acpi_generic_state *state,
				  void *context);

static acpi_status
acpi_ut_copy_ipackage_to_epackage(union acpi_operand_object *internal_object,
				  u8 * buffer, acpi_size * space_used);

static acpi_status
acpi_ut_copy_esimple_to_isimple(union acpi_object *user_obj,
				union acpi_operand_object **return_obj);

static acpi_status
acpi_ut_copy_simple_object(union acpi_operand_object *source_desc,
			   union acpi_operand_object *dest_desc);

static acpi_status
acpi_ut_copy_ielement_to_eelement(u8 object_type,
				  union acpi_operand_object *source_object,
				  union acpi_generic_state *state,
				  void *context);

static acpi_status
acpi_ut_copy_ipackage_to_ipackage(union acpi_operand_object *source_obj,
				  union acpi_operand_object *dest_obj,
				  struct acpi_walk_state *walk_state);

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_copy_isimple_to_esimple
 *
 * PARAMETERS:  internal_object     - Source object to be copied
 *              external_object     - Where to return the copied object
 *              data_space          - Where object data is returned (such as
 *                                    buffer and string data)
 *              buffer_space_used   - Length of data_space that was used
 *
 * RETURN:      Status
 *
 * DESCRIPTION: This function is called to copy a simple internal object to
 *              an external object.
 *
 *              The data_space buffer is assumed to have sufficient space for
 *              the object.
 *
 ******************************************************************************/

static acpi_status
acpi_ut_copy_isimple_to_esimple(union acpi_operand_object *internal_object,
				union acpi_object *external_object,
				u8 * data_space, acpi_size * buffer_space_used)
{
	acpi_status status = AE_OK;

	ACPI_FUNCTION_TRACE("ut_copy_isimple_to_esimple");

	*buffer_space_used = 0;

	/*
	 * Check for NULL object case (could be an uninitialized
	 * package element)
	 */
	if (!internal_object) {
		return_ACPI_STATUS(AE_OK);
	}

	/* Always clear the external object */

	ACPI_MEMSET(external_object, 0, sizeof(union acpi_object));

	/*
	 * In general, the external object will be the same type as
	 * the internal object
	 */
	external_object->type = ACPI_GET_OBJECT_TYPE(internal_object);

	/* However, only a limited number of external types are supported */

	switch (ACPI_GET_OBJECT_TYPE(internal_object)) {
	case ACPI_TYPE_STRING:

		external_object->string.pointer = (char *)data_space;
		external_object->string.length = internal_object->string.length;
		*buffer_space_used = ACPI_ROUND_UP_TO_NATIVE_WORD((acpi_size)
								  internal_object->
								  string.
								  length + 1);

		ACPI_MEMCPY((void *)data_space,
			    (void *)internal_object->string.pointer,
			    (acpi_size) internal_object->string.length + 1);
		break;

	case ACPI_TYPE_BUFFER:

		external_object->buffer.pointer = data_space;
		external_object->buffer.length = internal_object->buffer.length;
		*buffer_space_used =
		    ACPI_ROUND_UP_TO_NATIVE_WORD(internal_object->string.
						 length);

		ACPI_MEMCPY((void *)data_space,
			    (void *)internal_object->buffer.pointer,
			    internal_object->buffer.length);
		break;

	case ACPI_TYPE_INTEGER:

		external_object->integer.value = internal_object->integer.value;
		break;

	case ACPI_TYPE_LOCAL_REFERENCE:

		/*
		 * This is an object reference.  Attempt to dereference it.
		 */
		switch (internal_object->reference.opcode) {
		case AML_INT_NAMEPATH_OP:

			/* For namepath, return the object handle ("reference") */

		default:
			/*
			 * Use the object type of "Any" to indicate a reference
			 * to object containing a handle to an ACPI named object.
			 */
			external_object->type = ACPI_TYPE_ANY;
			external_object->reference.handle =
			    internal_object->reference.node;
			break;
		}
		break;

	case ACPI_TYPE_PROCESSOR:

		external_object->processor.proc_id =
		    internal_object->processor.proc_id;
		external_object->processor.pblk_address =
		    internal_object->processor.address;
		external_object->processor.pblk_length =
		    internal_object->processor.length;
		break;

	case ACPI_TYPE_POWER:

		external_object->power_resource.system_level =
		    internal_object->power_resource.system_level;

		external_object->power_resource.resource_order =
		    internal_object->power_resource.resource_order;
		break;

	default:
		/*
		 * There is no corresponding external object type
		 */
		return_ACPI_STATUS(AE_SUPPORT);
	}

	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_copy_ielement_to_eelement
 *
 * PARAMETERS:  acpi_pkg_callback
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Copy one package element to another package element
 *
 ******************************************************************************/

static acpi_status
acpi_ut_copy_ielement_to_eelement(u8 object_type,
				  union acpi_operand_object *source_object,
				  union acpi_generic_state *state,
				  void *context)
{
	acpi_status status = AE_OK;
	struct acpi_pkg_info *info = (struct acpi_pkg_info *)context;
	acpi_size object_space;
	u32 this_index;
	union acpi_object *target_object;

	ACPI_FUNCTION_ENTRY();

	this_index = state->pkg.index;
	target_object = (union acpi_object *)
	    &((union acpi_object *)(state->pkg.dest_object))->package.
	    elements[this_index];

	switch (object_type) {
	case ACPI_COPY_TYPE_SIMPLE:

		/*
		 * This is a simple or null object
		 */
		status = acpi_ut_copy_isimple_to_esimple(source_object,
							 target_object,
							 info->free_space,
							 &object_space);
		if (ACPI_FAILURE(status)) {
			return (status);
		}
		break;

	case ACPI_COPY_TYPE_PACKAGE:

		/*
		 * Build the package object
		 */
		target_object->type = ACPI_TYPE_PACKAGE;
		target_object->package.count = source_object->package.count;
		target_object->package.elements =
		    ACPI_CAST_PTR(union acpi_object, info->free_space);

		/*
		 * Pass the new package object back to the package walk routine
		 */
		state->pkg.this_target_obj = target_object;

		/*
		 * Save space for the array of objects (Package elements)
		 * update the buffer length counter
		 */
		object_space = ACPI_ROUND_UP_TO_NATIVE_WORD((acpi_size)
							    target_object->
							    package.count *
							    sizeof(union
								   acpi_object));
		break;

	default:
		return (AE_BAD_PARAMETER);
	}

	info->free_space += object_space;
	info->length += object_space;
	return (status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_copy_ipackage_to_epackage
 *
 * PARAMETERS:  internal_object     - Pointer to the object we are returning
 *              Buffer              - Where the object is returned
 *              space_used          - Where the object length is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: This function is called to place a package object in a user
 *              buffer.  A package object by definition contains other objects.
 *
 *              The buffer is assumed to have sufficient space for the object.
 *              The caller must have verified the buffer length needed using the
 *              acpi_ut_get_object_size function before calling this function.
 *
 ******************************************************************************/

static acpi_status
acpi_ut_copy_ipackage_to_epackage(union acpi_operand_object *internal_object,
				  u8 * buffer, acpi_size * space_used)
{
	union acpi_object *external_object;
	acpi_status status;
	struct acpi_pkg_info info;

	ACPI_FUNCTION_TRACE("ut_copy_ipackage_to_epackage");

	/*
	 * First package at head of the buffer
	 */
	external_object = ACPI_CAST_PTR(union acpi_object, buffer);

	/*
	 * Free space begins right after the first package
	 */
	info.length = ACPI_ROUND_UP_TO_NATIVE_WORD(sizeof(union acpi_object));
	info.free_space =
	    buffer + ACPI_ROUND_UP_TO_NATIVE_WORD(sizeof(union acpi_object));
	info.object_space = 0;
	info.num_packages = 1;

	external_object->type = ACPI_GET_OBJECT_TYPE(internal_object);
	external_object->package.count = internal_object->package.count;
	external_object->package.elements = ACPI_CAST_PTR(union acpi_object,
							  info.free_space);

	/*
	 * Leave room for an array of ACPI_OBJECTS in the buffer
	 * and move the free space past it
	 */
	info.length += (acpi_size) external_object->package.count *
	    ACPI_ROUND_UP_TO_NATIVE_WORD(sizeof(union acpi_object));
	info.free_space += external_object->package.count *
	    ACPI_ROUND_UP_TO_NATIVE_WORD(sizeof(union acpi_object));

	status = acpi_ut_walk_package_tree(internal_object, external_object,
					   acpi_ut_copy_ielement_to_eelement,
					   &info);

	*space_used = info.length;
	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_copy_iobject_to_eobject
 *
 * PARAMETERS:  internal_object     - The internal object to be converted
 *              buffer_ptr          - Where the object is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: This function is called to build an API object to be returned to
 *              the caller.
 *
 ******************************************************************************/

acpi_status
acpi_ut_copy_iobject_to_eobject(union acpi_operand_object *internal_object,
				struct acpi_buffer *ret_buffer)
{
	acpi_status status;

	ACPI_FUNCTION_TRACE("ut_copy_iobject_to_eobject");

	if (ACPI_GET_OBJECT_TYPE(internal_object) == ACPI_TYPE_PACKAGE) {
		/*
		 * Package object:  Copy all subobjects (including
		 * nested packages)
		 */
		status = acpi_ut_copy_ipackage_to_epackage(internal_object,
							   ret_buffer->pointer,
							   &ret_buffer->length);
	} else {
		/*
		 * Build a simple object (no nested objects)
		 */
		status = acpi_ut_copy_isimple_to_esimple(internal_object,
							 (union acpi_object *)
							 ret_buffer->pointer,
							 ((u8 *) ret_buffer->
							  pointer +
							  ACPI_ROUND_UP_TO_NATIVE_WORD
							  (sizeof
							   (union
							    acpi_object))),
							 &ret_buffer->length);
		/*
		 * build simple does not include the object size in the length
		 * so we add it in here
		 */
		ret_buffer->length += sizeof(union acpi_object);
	}

	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_copy_esimple_to_isimple
 *
 * PARAMETERS:  external_object     - The external object to be converted
 *              ret_internal_object - Where the internal object is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: This function copies an external object to an internal one.
 *              NOTE: Pointers can be copied, we don't need to copy data.
 *              (The pointers have to be valid in our address space no matter
 *              what we do with them!)
 *
 ******************************************************************************/

static acpi_status
acpi_ut_copy_esimple_to_isimple(union acpi_object *external_object,
				union acpi_operand_object **ret_internal_object)
{
	union acpi_operand_object *internal_object;

	ACPI_FUNCTION_TRACE("ut_copy_esimple_to_isimple");

	/*
	 * Simple types supported are: String, Buffer, Integer
	 */
	switch (external_object->type) {
	case ACPI_TYPE_STRING:
	case ACPI_TYPE_BUFFER:
	case ACPI_TYPE_INTEGER:

		internal_object = acpi_ut_create_internal_object((u8)
								 external_object->
								 type);
		if (!internal_object) {
			return_ACPI_STATUS(AE_NO_MEMORY);
		}
		break;

	default:
		/* All other types are not supported */

		return_ACPI_STATUS(AE_SUPPORT);
	}

	/* Must COPY string and buffer contents */